I just opened it up and found that the wheels holding the carousel plate down were a bit tight, so I loosened them up to allow it to move more freely. I was also in the process of removing the carousel to see if there was any gunk in the drive mechanism, but it looks clean.
After putting it back together, it won't recognize discs anymore. It properly spins the carousel, but won't acknowledge CD's in any way. It will open/close the tray, but the "Disc Skip" and all disc-selection buttons do nothing...
I checked the sensors and they appear to be getting voltage. Am I missing something? Is there some type of reset sequence on the unit?